Later a larger version would be located at the Lunar Landing Facility. The purpose of this simulator was to study the subject while walking, jumping or running. Researchers conducted studies of various factors such as fatigue limit, energy expenditure, and speed of locomotion.
Vigil wrote in his paper Discussion of Existing and Planned Simulators for Space Research, When the astronauts land on the moon they will be in an unfamiliar environment involving, particularly, a gravitational field only one-sixth as strong as on earth.
A novel method of simulating lunar gravity has been developed and is supported by a puppet-type suspension system at the end of a long pendulum. A floor is provided at the proper angle so that one-sixth of the subject' s weight is supported by the floor with the remainder being supported by the suspension system.
This simulator allows almost complete freedom in vertical translation and pitch and is considered to be a very realistic simulation of the lunar walking problem.
For this problem this simulator suffers only slightly from the restrictions in lateral movement it puts on the test subject. This is not considered a strong disadvantage for ordinary walking problems since most of the motions do, in fact, occur in the vertical plane. However, this simulation technique would be severely restrictive if applied to the study of the extra-vehicular locomotion problem, for example, because in this situation complete six degrees of freedom are rather necessary.
This technique, in effect, automatically introduces a two-axis attitude stabilization system into the problem. As far as I can tell, the little holes in the perfboard cause the molten ABS to flow into them and hence achieve a mechanical interlock, way better than counting on the strong force interaction or something with a smooth tape.
The Up came with 3 pieces of 2mm-space perfboard. The more you know… After experimenting with the Up, I was determined to tune our Replicator to achieve similar qualities. Most of all, I was out to play with the support generation to see if I can achieve a less tenaciously integrated support lattice. I began by turning down the support flow rate ratio in Skeinforge way down. I had noticed before that the support material was almost as thick as my part lines, which seemed unnecessary.
This did involve figuring out a better system so I could get the raft off the part easier the denser interface layers appeared to want to stick to the part more than anything else. I tested these settings by printing a few overhang dongles using full support and rafts, then when I thought I was at a good location, by test printing a difficult object which required full supports: this figurine on Thingiverse. I think it turned out pretty damn great.
Full disclosure: I tried this on the Up! Chunking off the support was pretty easy, but there were definitely lots of areas where I had to knife pretty hard. Additionally, one thing I noticed was that the long runs of very thin support lattice seen in the first picture of the print tended to warp and buckle much easier than a thin walled part would, probably because the flow rate is modified so much.
Once that happens it seemed to happen at the base of the model , it is generally very hard for it to pick itself up again. Still not Up! I next tried this method on the ultimate test: something I 3d scanned, so is not going to be remotely clean or easy anywhere. The model in question is a Hatsune Miku mini-Nendoroid figure that I own.
Hey, when did I get a 3D scanner?! This NextEngine triangulating laser scanner is one of them. Since this was pretty much my first stab at 3D scanning, I neglected to take more than a few orientation scans which meant the model had a ton of uncloseable holes in it and then tried to save it at full resolution into an STL. The result was a megabyte STL file that nothing could open or slice.
I had to go back and greatly simplify the polygon count in order for ReplicatorG to even think about working with it. It looks really messy and disgusting on the outside, but the interior is a regular grid of very fine blobs and lines. Since the whole point of this exercise is really just to get me a Miku figure clone, I tried it on the venerable Up.
It handled the errorful STL wonderfully, though it pointed out to me where each and every one of the missing faces was. And no matter how removable the Up support is, it was still made out of the same ABS and so I had to cut part of her loop antenna structure off to remove the internal support, then reglue it back on. Her legs are also… uhh, detachable?
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